Spindling plug for paper cores.



PATENTED MAR. 3, 1908. W. H. MUNROB. SPINDLING PLUG POR PAPER CORES.

APPLICATION FILED JUNE 3.1907.

f No. 880,687.

tmf,

UNITED STATES PATENT OFFICE.

WILLIAM H. MUNROE, OF MAPLEWOOD, MASSACHUSETTS.

Specification of Letters Patent.

Patented March 3, 1908.

.Application filed .Tune 3. 1907. Serial No. 377.110.

To all whom it may concern:

Be it known that I, WILLIAM II. MUNROE, a citizen of the United States,residing at Maplewood, in the county of Middlesex and State ofMassachusetts, have invented certain new and useful Improvements inSpindling Plugs for Paper Cores, of which the following is, aspecification.

My invention relates to theapplication of plugs or spindle bearings tothe ends of the tubular shells which, in many arts, serve as centralcores for rolls of paper, cloth, or other materials in sheet form whichare wound er spooled thereon.

For many reasons it is desirable that such cores be of the minimumweight consistent with the stress they may be called u on to stand inservice, and hence non-metal ic materials of a tough nature, for examplepaper, are frequently employed in the formation of the same.

`which it carries is being either spooled or ru'lwound.

.p I am aware that metallic spindling plugs have hitherto been appliedto the ends of i ,tubular paper cores or this purpose, but

such plugs have been usua y attached thereto by pins, screws, or bymeans of in- Vstrurnentalities of the like nature, passing through theaper core, and also engaging the plug. T is method of attaching theplugs to the core ends is not satisfactory or permanent, as the stressesincident to service will cause said plugs in time to becomeloosened andto tear away from the ends of the core in spite of the attachinginstrumentalities.

My invention aims to provide a construction whereby a preferablymetallic spindling plug may be attached to the ends of tubular 'coresfpreferably of non-metallic materials,

in a manner insuring pernianency of attachment as well as durability inservice.

In the drawin s, Figure 1 shows, partly in section, one end of a rollhaving a spindling plug attached thereto in accordance with myinvention, aswell as a portion of the spindle adapted to t therein. Fig.2 is a view of the outside end of the plug. Fig. 3 shows,

partly in section, the jacket preferably used in conjunction with theplug. p

Referring to the drawings, 1, Fig. 1, represents one end of a tubular aer core. At 2 is the spindling plug, interior y bored to receive thespindle 3. Said spindle 3 preferably has the collar 4 by which thespindle may be ositioned longitudinally with respect to p ug 2, and apinor key5 is provided, adapted to enga e in slot 6 in plug 2, Figs. 1and 2, and there the spindle with respect to the plug.

For a portion of its length the plug is preferably exteriorly threaded,with a tapering thread of the woodscrew type. The diameter of thethreaded portion of the plug at its inner end 7 is substantially equalto that of the interior of the pa er core, in order to permit its beingentereld and screwed into the same. to insure the necessary tenacity ofhold between the plug and the end of the core when it is screwed intothe same.

Surrounding that portion of the core end which is in engagement thethreaded ortion kof the lug and extending alon t e unthreaded len th ofthe plug at 8, fgor a short distance, as ar as the retaining groove 9,is the jacket 10. Said jacket, shown inits original condition in Fig. 3,is a cylindrical shell, preferably of thin, but strong and ductile,metal, so sized with relation to the core as to y to prevent therotation of The depth of the threads is sufIicient closely fit on theexterior of the same. The

outside diameter of the jacket is preferably that of the plug 2 4at itsoutside end 11, but in order to permit the jacket to extend over theplug to the retaining groove 9 the plug is small enough in diameter at 8to permit the same to enter into the interior of the jacket. Theretaininr groove extends circumferentially around the plug where surface8 ends, and it is of a depth to insure a diameter at the bottom of thegroove somewhat less than that of the plug at 8.

The manner of attaching plug 2 to the end 1 of the paper core is asfollows. The' jacket is first slipped over the core end, enough of itslength being left projecting past the same to 'reach to the retaininggroove when the plug is ut in place. Plug 2 is then inserted into t ecore end and is screwed home, the` jacket meanwhile co erating with thecore in preventing the brea ing or undue expansion of the core end underthe expansive influence exerted by the screwing in of the plug. Afterthe plug is that portion of the core not surrounded by .screwed up intoplace, the edge 12 of jacket -ytiiiform diameter of the core throughoutits 1() is beaded over or other wise forced into the retaining groove 9,and other supplefitted with metallic plugs I While l have moreparticularly described my invention with reference to paper cores do notmean to mentary grooves 13 and 14, or other inconfine myself in any wayto the materials dentations adapted to perform a similarspecically'stated.

function, are formed on the surface of the Having described myinvention, I jacket, thereby firmly securing jacket 10 new and desire tosecure by Letters longitudinally with reference to the core end. l 1. lncombination with a tubular This securing the jacket longitudinally withl respect to both core end and the spindling plug is desirable not onlybecause of the obvious increase of strength imparted to the wholeconstruction by such a practice, but also because a jacket thus securedwill prevent the unscrewing of the plugs from the core end if by mistakethe plugs be subjected to a torsional stress tending to unscrew themfrom the core ends. The other end of the core may be iitted with a sindling plug in the same manner as just a ove described, and the core isthen ready for use as a central core upon which material may be wound.

It is preferable that the plugs be made, one with a rightand the otherwith a left-hand thread, so that any torsional stress put upon `saidplugs will tend to tighten the same, and not to unscrew them.Furthermore since mechanically separate from said rounding said core end2. In combination with a tubular 3. ln combination with a tubularinterior of the end of said core, and

the jacket will be of slightly `less diameter than the jacket, it may beadvisable to build up said ortion ofthe core by the addition of severalayers of paper in order to insure a end. c

4. In combination with a non length.

While I have above described a plug designed to engage the core end bymeans of threads of a considerable depth formed thereclaim as Patent:winding core, a spindling plug engaging with the interior of the end ofsaid core, and a jacket, plug, surand longitudinally fixed withreference to plug and to core end.

Winding core, a spindling plug adapted to engage with the interior ofthe end of the said core, and a jacket surrounding the said core end anplug lying therein, said jacket being in engagement with the said plugand having superiicial indentations whereby it is longitudinally fixedwith relation to the said core end.

winding core, a spindling plug provided with a retaining groove, andadapted to engage within the a jacket surrounding said core end and theplug lying therein, said jacket being in engagement with said plug, andhaving circumferential grooves S5 whereby the said jacket engages thecore metallic tubular winding core, a spindling plug having a portion ofits length exteriorly threaded, 9 0 and adapted to screw into theinterior of the end of said core, said plug also having a retaininggroove formed in its Unthreaded portion, and an outside jacketsurrounding the on, it is sufficient in many cases, especially j saidcore end and the threaded portion of the those in which the core issubjected to a 1cbomparatively light duty, that the threads e o with;the plug in the latter case being merely l the exterior of the saidcrore en driven into the core and held therein by fricj 5. lncombination with a tubular tion alone.

lIn cases Where a plug of the latter type is used the jacket is firstplaced in position plug lying therein, said jacket being ,in engagementwith the retaining groove of the slight depth, or even Wholly dispensedj plug, and also embodying means engaging winding 1 o 0 around the coreend as hereinbefore d l plug, surrounding said core end andlongiscribed, and the plug is then driven into tudinally fixed withrelation both osition. When the plug is in place the plug and said coreend.

jacket as before may be longitudinally fixed with relation to both plugand core end by j in presence of two witnesses. circumferential groovesor other indentations,

or by pins, rivets or the like. ln many cases j l/VILLIAM H. MUN thefrictional engagement between the surl face of the core end and thejacket is suffij cient to longitudinally iix the jacket with relation tothe core end.

to said ln testimony whereof l affix my signature ROE.

